The free Retirement Calculator projects your nest egg at retirement and converts it into an estimated monthly income using the 4% safe withdrawal rule. Enter your current age, target retirement age, existing savings, monthly contributions, and expected return to see a complete retirement picture — including inflation-adjusted values.
How the Retirement Calculator Works
The calculator uses the compound growth formula applied in two stages: first it grows your current savings balance over the years to retirement, then it adds the future value of all your monthly contributions. The formula is: Nest Egg = CurrentSavings × (1 + r)^n + MonthlyContrib × [(1 + r)^n − 1] / r, where r is the monthly return rate and n is months until retirement. Monthly retirement income is then calculated as Nest Egg × 4% ÷ 12 using the 4% safe withdrawal rule.
3 Real-World Examples
Age 30 with $50,000 saved, contributing $600/month until 65 at 7% average return → ~$2.1M nest egg → $7,000/month using the 4% withdrawal rule. That's $84,000/year in retirement income.
$20,000 saved, contributing $1,500/month for 20 years at 6.5% → ~$840,000 by age 65 → $2,800/month using the 4% rule. Still achievable — aggressive saving compensates for less time.
$500/month for 30 years at 6% = $503,000. At 7% = $567,000. At 8% = $679,000. An extra 2% return adds $176,000 — why choosing the right investment matters as much as how much you save.
Tips to Build a Larger Retirement Nest Egg
- Always contribute at least enough to your 401(k) to capture the full employer match — it is an immediate 50–100% return on that money.
- Increase your contribution rate by 1% every year, especially after raises — most people never notice the difference in take-home pay.
- Invest in low-cost index funds; a 1% annual fee difference compounds to tens of thousands of dollars lost over a 30-year career.
- Delay Social Security to age 70 if possible — benefits increase roughly 8% per year between full retirement age and 70, adding hundreds per month for life.
Understanding the 4% Safe Withdrawal Rule
The 4% rule originated from the 1994 Trinity Study, which analyzed historical stock and bond returns to determine sustainable withdrawal rates over 30-year retirements. The conclusion: withdrawing 4% of your portfolio in year one, then adjusting for inflation annually, resulted in portfolio survival in 95%+ of historical scenarios. This translates to a simple target: save 25 times your annual spending. If you need $60,000/year, target a $1.5M nest egg. Note that the 4% rule assumes a balanced portfolio of approximately 60% stocks and 40% bonds — a more aggressive or conservative allocation may require adjusting the withdrawal rate.